0f7f3c0d54
- internal structure rearrangement; - respond to char device open requests to avoid hanging VFS threads; - make drivers use designated initializers; - use devminor_t for all minor device numbers; - change bdr_other hook to take ipc_status and return nothing; - fix default geometry computation; - add support for sef_cancel. Change-Id: Ia063a136a3ddb2b78de36180feda870605753d70
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* This file contains the singlethreaded device driver interface.
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*
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* Changes:
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* Aug 27, 2011 extracted from driver.c (A. Welzel)
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*
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* The entry points into this file are:
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* blockdriver_task: the main message loop of the driver
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* blockdriver_terminate: break out of the main message loop
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* blockdriver_receive_mq: message receive interface with message queueing
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* blockdriver_mq_queue: queue an incoming message for later processing
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*/
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#include <minix/drivers.h>
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#include <minix/blockdriver.h>
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#include "const.h"
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#include "driver.h"
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#include "mq.h"
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static int running;
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/*===========================================================================*
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* blockdriver_receive_mq *
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*===========================================================================*/
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int blockdriver_receive_mq(message *m_ptr, int *status_ptr)
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{
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/* receive() interface for drivers with message queueing. */
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/* Any queued messages? */
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if (mq_dequeue(SINGLE_THREAD, m_ptr, status_ptr))
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return OK;
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/* Fall back to standard receive() interface otherwise. */
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return driver_receive(ANY, m_ptr, status_ptr);
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}
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/*===========================================================================*
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* blockdriver_terminate *
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*===========================================================================*/
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void blockdriver_terminate(void)
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{
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/* Break out of the main driver loop after finishing the current request. */
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running = FALSE;
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sef_cancel();
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}
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/*===========================================================================*
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* blockdriver_task *
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*===========================================================================*/
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void blockdriver_task(struct blockdriver *bdp)
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{
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/* Main program of any block device driver task. */
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int r, ipc_status;
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message mess;
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running = TRUE;
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/* Here is the main loop of the disk task. It waits for a message, carries
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* it out, and sends a reply.
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*/
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while (running) {
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if ((r = blockdriver_receive_mq(&mess, &ipc_status)) != OK) {
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if (r == EINTR && !running)
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break;
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panic("blockdriver_receive_mq failed: %d", r);
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}
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blockdriver_process(bdp, &mess, ipc_status);
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}
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}
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/*===========================================================================*
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* blockdriver_process *
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*===========================================================================*/
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void blockdriver_process(struct blockdriver *bdp, message *m_ptr,
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int ipc_status)
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{
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/* Handle the given received message. */
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blockdriver_process_on_thread(bdp, m_ptr, ipc_status, SINGLE_THREAD);
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}
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/*===========================================================================*
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* blockdriver_mq_queue *
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*===========================================================================*/
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int blockdriver_mq_queue(message *m, int status)
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{
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/* Queue a message for later processing. */
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return mq_enqueue(SINGLE_THREAD, m, status);
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}
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